CLAS physics database search results Measurement E209M27 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.64 0.1801 0.0443 0.0174 1.72 -0.0143 0.022 0.0173 1.8 -0.1027 0.0187 0.0173 1.88 -0.0869 0.0186 0.0173 1.96 -0.0356 0.0202 0.0173 2.04 -0.014 0.0216 0.0173 2.12 -0.0311 0.024 0.0173 2.2 -0.0096 0.0278 0.0173 2.28 0.0817 0.0333 0.0173 2.36 0.1868 0.0404 0.0174